The big day for Turk and Carla has finally arrived, but a patient holds up Turk.

J.D. is unsure what to do, when he realizes he made a mistake telling Elliot he loved her.

Elliot asks Sean to move in with her, which only adds to J.D.'s problems.

J.D. hooks up with Danni again, after Sean returns, but he can't forget about his passionate night with Elliot.

Turk has to confront a young patient of his, when he accidentally cuts a nerve and the boy (who happens to be a concert pianist) loses use of one of his hands.

J.D. must keep a secret when Carla's "what-if" guy asks her out on a date.

An ever present butterfly prompts the question on what could have happened different as Turk looks for his lucky do-rag for surgery, and Elliot tries to find a lost stuffed animal for a child needing a bone marrow transplant.

Jordan's friends Allison and Maddie come to town to provide moral support for Jordan after her brother's death – however, their constant presence does not provide any relief to Dr. Cox.

Jordan's brother and sister return, but Dr. Cox learns that his brother-in-law Ben hasn't visited a doctor about his cancer in the two years he has been gone traveling the world.

Elliot finds herself perplexed over a simple procedure that leaves her questioning her career path. She goes to seek Dr. Kevin Casey's advice but becomes frustrated when she learns that the epiphany toilet, which the Janitor secretly installed on the roof, is getting more attention than she is.

J.D. believes, he may have finally found a mentor in Dr. Kevin Casey, a surgeon with obsessive-compulsive disorder, and it turns out, that Dr. Cox has always been jealous of the guy.

J.D. tries to break up with Danni, but she beats him to it when she realizes that she will always be second place to Elliot in his heart.

Carla and Elliot try to help Maggie, a dying patient, to lose her virginity as she prepares to die.

Elliot is feeling uncomfortable using clinical terms for her patients' private parts – a result of a repressed childhood and an accidental orgasm she inflicted on a patient during a pelvic exam - so Carla tries to teach her how to say "vagina" and "penis" without blushing.

Turk is happy that he finally makes it through a solo surgery without the assistance of an attending surgeon.

As J.D.'s relationship with Danni progresses, he and Dr. Cox are forced to spend more time together outside of the hospital, to Perry's great chagrin.

A chance meeting in the elevator sparks a new friendship between J.D. and the mysterious Danni whose ongoing dialogue about her ex-boyfriend forces J.D. to talk about his feelings for Elliot.

His brother Dan decides to stay with J.D. for a while after their mom's new fiancé kicked him out, but after spending some quality time with him at the hospital, Dan isn't sure if he likes the cynical person his little brother has become.

Sean is a bit surprised and disturbed to learn about Elliot and J.D.'s history together, but it turns out that his anger is really a cover up for his upcoming six month long trip and he doesn't want Elliot to explode.

Finding difficulties in training his interns, J.D. asks Elliot for some help. She tells J.D. about Sean, who gave Elliot great tips based on his dolphin training that fit perfectly for her interns.

J.D. is feeling left out of his friendship with Turk and gets hurt when Turk is scared of opening up to him.

A run-in with her old flame Sean and an accident in her new car lead Elliot to the realization that nothing good has happened to her in the three years she has been at Sacred Heart. This realization drives her to take drastic measures, including a complete makeover, both inside and out, in an attempt to change her luck.